package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 过滤器  检查用户是否登录
 */
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;


        //1.获取本次请求的uri
        String requestURI = request.getRequestURI();
            //定义不需要处理也就是不需要拦截的路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        //2.判断本次的请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.如果不需要处理,则直接放行
        if(check){
            //放行
            filterChain.doFilter(request,response);
             return;
        }
        //4.判断登录状态,如果已登录,则直接放行
          if(request.getSession().getAttribute("employee")!=null){
              //在放行之前,获取登录用户的信息,调用basecontext工具类中的ThreadLocal,把id放进去
              Long id = (Long) request.getSession().getAttribute("employee");
              BaseContext.setCurrentId(id);
              //放行
              filterChain.doFilter(request,response);
              return;
          }
             //判断移动端的登录状态
               if(request.getSession().getAttribute("user")!=null){
                   Long id = (Long) request.getSession().getAttribute("user");
                     //然后把登录用户id放进ThreadLocal中
                    BaseContext.setCurrentId(id);
                   //放行
                   filterChain.doFilter(request,response);
                   return;
               }
          //5.如果未登录,则返回未登录结果
            response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
            log.info("拦截到请求:{}",request.getRequestURI());
              return;
    }
    /**
     * 路径匹配,检查本次请求是否需要放行
     */
       public boolean check(String[] urls ,String requestURI){
           for (String url : urls) {
               boolean match = PATH_MATCHER.match(url, requestURI);
               if(match){
                   return true;
               }
           }
                    return  false;
       }
}
